Magnetic flux leakage (MFL) method is a non-destructive method commonly used for equipment with ferromagnetic material. This paper presents a low frequency alternating current (AC) excitation MFL method. This method uses low frequency AC current excitation to obtain a high detection depth, and to realize the examination of internal and external surface of the ferromagnetic structures. Based on the low frequency AC excitation simulation model built in ANSYS Electronics18.1 software, the amplitude and phase parameters of magnetic field were extracted and calculated. With the changes of the defect depths in different positions of the steel plate, the results of amplitude and phase parameters of magnetic field were studied and analyzed. Then the experiments of detection on artificial defects with different depths in different positions were conducted. The simulation and experimental results were discussed.

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